dunt matter as long as it turns 90 degrees
i think you will find its 20nm then 90 deg. then a further 90 deg, working in a patern radiating from the centre two!
you dont need a torque wrench for 90 deg but you do need to put a paint(tippex) blob on top centre(12o'clock) and it should then be moved to 3'oclock and then 6 o'clock
thats the easiest method i know!